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Duration of limiting asthma/breathing problem: No. units

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For persons under age 18 who have at least one activity limitation (LANY), and for whom either asthma or a breathing problem was reported as a condition causing any activity limitation (CLIMASTHMA), CLIMASTHMANO reports the number of time units which the respondent stated when reporting the duration of asthma or the breathing problem.

Data on the duration of limiting asthma or breathing problem were collected via the question, "How long [have/has] [you/person] had [asthma or a breathing problem]?" Respondents could answer this open-ended question using the time unit of their choice (i.e., days, weeks, months, year, or since birth). The original responses to the question are reported in two complementary variables, CLIMASTHMATP (which specifies the time unit) and CLIMASTHMANO (which, as noted above, reports the number of such units). For the NHIS public use files, the National Center for Health Statistics (NCHS) recoded the results from these two variables to create two other variables using standard time units: years (CLIMASTHMAY) and groups of months (CLIMASTHMAMO).


The variable is completely comparable across time.


  • 1997-2013; 2014 2015 2016 2017 2018: Persons under age 18 limited due to asthma/breathing problem.


  • 1997-2018